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Finding the Fourth Proportional to 83.80, 125.60 and 43.24

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Solution

The fourth proportional to 83.80, 125.60 and 43.24 is: 64.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.80 : 125.60 = 43.24 : x
  2. Step 2: Convert to fraction form
    83.80/125.60 = 43.24/x
  3. Step 3: Cross multiply
    83.80x = 125.60 × 43.24
  4. Step 4: Simplify right side
    83.80x = 5,430.94
  5. Step 5: Solve for x
    x = 5,430.94/83.80
  6. Step 6: Final answer
    x = 64.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.